JP2013230711A - Wiper pivot device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper pivot device in which a pivot cover is separated from a pivot holder and a pathway of water flowing in a radial direction of the pivot cover is elongated without complicating the shape of the pivot cover to weaken the vigor of water flow.SOLUTION: A DR side pivot cover 50 fitted on a DR side pivot holder is formed from a fitting part 51, a bottom part 52 and a wall part 53, a water flow guide part 54 which assumes a rugged shape toward the axial direction of a DR side pivot shaft with respect to the bottom part 52 is disposed and the water flow guide part 54 which elongates a pathway RT1 of rain water or the like flowing to a radial direction of the DR side pivot shaft through the bottom part 52 and a water discharge part 55 which discharges rain water or the like received by the bottom part 52 to an external part is disposed on the side opposite to the water flow guide part 54 side via the fitting part 51.

Description

  The present invention relates to a pivot shaft to which a wiper member is attached, a pivot holder that rotatably supports the pivot shaft, and a pivot that is attached to the pivot holder and prevents the connecting portion between the pivot shaft and the link member from being wetted. The present invention relates to a wiper pivot device including a cover.

  2. Description of the Related Art Conventionally, a wiper device is mounted on a vehicle such as an automobile in order to wipe off rainwater and the like adhering to a windshield and ensure a good field of view. The wiper device includes an electric motor as a drive source, a link member that converts the rotational motion of the electric motor into a swing motion, a pivot shaft that is swing-driven by the link member, and a pivot shaft that is fixed to the vehicle and rotates the pivot shaft A pivot holder that is freely supported and a wiper member that is attached to a tip end portion of the pivot shaft are provided.

  A wiper device mounted on a vehicle such as an automobile is mounted inside a bulkhead or the like located on the front end side of the windshield and covered with a cowl top panel. A pivot hole is provided in the cowl top panel, and a tip end portion of the pivot shaft extends outward from the pivot hole. A portion of the wiper device facing the pivot hole is provided with a pivot cover formed in a substantially bowl shape, and the pivot cover is connected to a pivot lever fixed to the proximal end portion of the pivot shaft and a link member ( Ball joints, etc.) are prevented from getting wet. Here, the wiper pivot device is formed by the pivot shaft, the pivot holder, and the pivot cover.

  As described above, for example, the techniques described in Patent Document 1 and Patent Document 2 are known as wiper pivot devices that prevent the connection portion from being wetted.

  A wiper pivot (wiper pivot device) described in Patent Document 1 includes a pivot holder having a fixed piece fixed to a vehicle, and a holder body of the pivot holder is capable of rotating a pivot shaft (pivot shaft). I support it. The pivot holder is integrally provided with a flange so as to extend in the radial direction of the pivot shaft, and the flange is integrally provided with a peripheral wall, an arc-shaped rib, and a plurality of radial ribs. The peripheral wall, the arc-shaped rib, and the plurality of radial ribs extend in the axial direction of the pivot shaft. A drainage gate is provided on the radial rib side of the peripheral wall to drain rainwater that has fallen onto the pivot holder to the outside. It has been.

  In the wiper pivot described in Patent Document 1, a flange portion, a peripheral wall, an arc-shaped rib, and a plurality of radial ribs corresponding to a pivot cover are integrally formed on a pivot holder by die-casting a zinc alloy or a magnesium alloy. . Then, rainwater or the like that falls between the holder main body and the arc-shaped rib is led to the inner wall surface of the arc-shaped rib, the outer wall surface of the holder main body, and the wall surface of the radial rib, and is drained to the outside from the drain gate. Yes.

  On the other hand, the wiper pivot (wiper pivot device) described in Patent Document 2 includes a waterproof cap (pivot cover) that is separate from the pivot holder, and the waterproof cap is formed of rubber or the like. It is designed to be installed around. The waterproof cap includes an umbrella portion, and the umbrella portion is provided with an inclined surface inclined from the outer peripheral edge toward the center downward. A plurality of weirs radiating from the central part to the peripheral part are erected on the slope surface, and rainwater is discharged from a drain outlet provided in the central part of the umbrella part through a water collecting channel in the central part of the umbrella part. To drain.

JP 2006-297969 A (FIG. 3) JP 2002-127874 A (FIG. 1)

  However, according to the wiper pivot described in Patent Document 1 described above, the holder main body, the fixing piece, the flange, the peripheral wall, the arc-shaped rib, and the plurality of radial ribs are integrally formed by die-casting a zinc alloy, a magnesium alloy, or the like. Since it is molded, the mold for forming the pivot holder is complicated, and a mold is required for each vehicle type, resulting in an increase in manufacturing cost. In addition, problems such as an increase in the weight of the pivot holder may occur. On the other hand, according to the wiper pivot described in the above-mentioned Patent Document 2, since the pivot holder and the waterproof cap are separated, the above-mentioned problems can be solved, but in terms of the drainage function as shown below. Problems can arise.

  In other words, in Patent Document 2, a plurality of weirs that are arranged radially from the central part to the peripheral part are erected on the umbrella part of the waterproof cap, but between the central part and the peripheral part, The surface is straight and has no unevenness in the radial direction. Therefore, in some cases, rainwater or the like that has fallen on the umbrella part flows vigorously along the slope surface (umbrella part) from the central part toward the peripheral part, and as a result, it passes over the outer peripheral edge and leaks to the outside. Can cause problems.

  An object of the present invention is to make the pivot cover separate from the pivot holder and to make the path of water flowing in the radial direction of the pivot cover longer without complicating the shape, thereby weakening the momentum of the water flow. An object of the present invention is to provide a wiper pivot device that can be used.

  The wiper pivot device according to the present invention includes a pivot shaft to which a wiper member is attached, a pivot holder that rotatably supports the pivot shaft, and a connecting portion that is attached to the pivot holder and connects the pivot shaft and the link member. A wiper pivot device comprising a pivot cover for suppressing water, wherein the pivot cover is mounted on a holder tube portion of the pivot holder, and radially outward of the pivot shaft from the mounting portion A bottom portion for receiving water flowing from the wiper member side of the pivot shaft, and extending from the bottom portion to one side in the axial direction of the pivot shaft and suppressing leakage of the water received by the bottom portion to the outside A wall portion, provided between the mounting portion of the bottom portion and the wall portion and on the side of the connecting portion, and oriented in the axial direction of the pivot shaft with respect to the bottom portion; A water flow guide portion that lengthens the path of the water flowing in the radial direction of the pivot shaft through the bottom, and provided on the opposite side of the water flow guide portion across the mounting portion, And a drainage unit for draining the water received at the bottom to the outside.

  In the wiper pivot device according to the present invention, the water flow guide portion is formed to protrude in one axial direction of the pivot shaft, and the water flow toward the drainage portion is formed on the drainage portion side of the waterflow guide portion. An inclined surface that guides the movement is provided.

  In the wiper pivot device according to the present invention, the wiper pivot device is configured such that a radially inner side of a pivot hole formed in a wiper cover of a mounting portion on which the wiper pivot device is mounted faces the inclined surface toward the axial direction of the pivot shaft. It is mounted on the mounting portion so as to overlap.

  The wiper pivot device according to the present invention is characterized in that the drainage part is formed on at least one of the bottom part and the wall part.

  In the wiper pivot device according to the present invention, the holder cylindrical portion is provided with an engaging convex portion protruding radially outward of the holder cylindrical portion, and the engaging convex portion enters the drainage portion side of the mounting portion so that the pivot An engagement recess for preventing the cover from rotating with respect to the pivot holder is provided.

  According to the wiper pivot device of the present invention, the pivot cover to be attached to the pivot holder is formed from the attachment portion, the bottom portion, and the wall portion, and between the attachment portion and the wall portion of the bottom portion and on the connecting portion side. A water flow guide portion that is concave and convex in the axial direction of the pivot shaft with respect to the bottom portion, lengthens the path of water flowing in the radial direction of the pivot shaft through the bottom portion, and the water flow guide portion side across the mounting portion On the opposite side, a drainage unit is provided to drain the water received at the bottom to the outside. Accordingly, the path of the water flowing in the radial direction along the bottom portion on the connecting portion side of the pivot cover can be made longer than before without the water flow guide portion, and thus in the radial direction of the water received at the bottom portion. The momentum of the flow can be weakened. Therefore, it is possible to suppress the water received at the bottom from leaking to the outside over the wall, and as a result, the reliability of the wiper pivot device can be improved. In addition, the pivot cover is a separate body, and the water flow guide part is formed in a concavo-convex shape that allows water to flow therethrough, so it is not necessary to increase the height and depth of the concavo-convex shape, and the pivot cover shape is complicated Therefore, it is possible to suppress an increase in manufacturing cost.

  According to the wiper pivot device of the present invention, the water flow guide portion is formed so as to protrude to one axial direction of the pivot shaft, and the water flow guide portion on the drainage portion side is inclined to guide the water flow toward the drainage portion. Since the surface is provided, the water received at the bottom portion can be smoothly guided toward the drainage portion, and as a result, the water can be prevented from collecting in the pivot cover.

  According to the wiper pivot device of the present invention, the wiper pivot device is configured such that the radially inner side of the pivot hole formed in the wiper cover of the mounting portion on which the wiper pivot device is mounted overlaps the inclined surface toward the axial direction of the pivot shaft. Since it is mounted on the mounting portion, the water flowing from the wiper cover through the pivot hole can be guided to the inclined surface, and the water in the pivot cover can be efficiently drained to the outside.

  According to the wiper pivot device of the present invention, the drainage part can be formed on at least one of the bottom part and the wall part. In addition, an engagement convex portion that protrudes radially outward of the holder cylindrical portion is provided in the holder cylindrical portion, and the engagement convex portion enters the drainage portion side of the mounting portion to engage the pivot cover with respect to the pivot holder. A recess can also be provided.

It is explanatory drawing explaining the mounting state to the vehicle of a wiper apparatus. It is a perspective view which expands and shows the wiper pivot device concerning the present invention. It is a perspective view which shows the pivot holder of FIG. (A) is a perspective view which shows the front side of the pivot cover of FIG. 2, (b) is a perspective view which shows the back side of the pivot cover of FIG. FIG. 3 is a cross-sectional view across the mounting portion of the pivot cover as viewed from the direction of arrow A in FIG. 2. It is sectional drawing which crosses the pivot axis | shaft of the wiper pivot apparatus seen from the arrow A direction of FIG. (A) is a partially enlarged cross-sectional view showing the broken-line circle B portion of FIG. 6 in an enlarged manner, (b) is a partially enlarged cross-sectional view showing a comparative example (no water flow guide portion) corresponding to the broken-line circle B portion of FIG. is there. It is sectional drawing corresponding to FIG. 5 of the pivot cover which concerns on 2nd Embodiment. It is a partial expanded sectional view corresponding to the broken-line circle | round | yen C part of FIG. 5 of the pivot cover which concerns on 3rd Embodiment. It is a partial expanded sectional view corresponding to the broken-line circle | round | yen C part of FIG. 5 of the pivot cover which concerns on 4th Embodiment.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view for explaining a state where the wiper device is mounted on a vehicle, FIG. 2 is an enlarged perspective view showing the wiper pivot device according to the present invention, and FIG. 3 is a perspective view showing the pivot holder of FIG. 4A is a perspective view showing the front side of the pivot cover in FIG. 2, FIG. 4B is a perspective view showing the back side of the pivot cover in FIG. 2, and FIG. 5 is a pivot cover as seen from the direction of arrow A in FIG. FIG. 6 is a cross-sectional view across the pivot axis of the wiper pivot device viewed from the direction of arrow A in FIG. 2, and FIG. 7 (a) is an enlarged view of the broken-line circle B in FIG. The partial expanded sectional view shown, (b) represents the partial expanded sectional view which shows the comparative example (without a water flow guide part) corresponding to the broken-line circle B part of FIG.

  As shown in FIG. 1, a windshield 12 as a windshield is provided on the front side of a vehicle body 11 in a vehicle 10 such as an automobile. On the windshield 12, a DR side (driver's seat side) wiper member 13 and an AS side (passenger seat side) wiper member 14 for wiping rainwater, dust and the like attached to the windshield 12 are provided.

  The DR-side wiper member 13 includes a DR-side wiper blade 13a and a DR-side wiper arm 13b, and the DR-side wiper blade 13a is rotatably provided at the distal end side of the DR-side wiper arm 13b. The AS-side wiper member 14 includes an AS-side wiper blade 14a and an AS-side wiper arm 14b, and the AS-side wiper blade 14a is rotatably provided on the tip side of the AS-side wiper arm 14b. The wiper blades 13a and 14a are in elastic contact with the windshield 12 by coil springs (not shown) provided inside the wiper arms 13b and 14b.

  The wiper blades 13a and 14a are synchronized in the same direction with the wiping ranges 15a and 15b (two-dot chain lines in the figure) formed between the lower inversion position LRP and the upper inversion position URP on the windshield 12, respectively. The wiping pattern of each wiper member 13, 14 adopts a so-called tandem type.

  On the front end side (lower side in the figure) of the windshield 12 in the vehicle body 11, a mounting space (mounting portion) 11 a is provided close to a bulk head (not shown), and each wiper member 13 is provided inside the mounting space 11 a. , 14 is swingably driven. The wiper device 20 is driven by an operation of a wiper switch (not shown) provided in the vehicle interior, whereby the wiper members 13 and 14 are wiped back and forth on the windshield 12 to wipe off deposits such as rainwater. It is supposed to be.

  The wiper device 20 is covered with a cowl top panel (wiper cover) 16 attached to the opening portion of the mounting space 11a as indicated by a two-dot chain line in the figure. The cowl top panel 16 prevents the wiper device 20 from getting wet, and covers the wiper device 20 to improve the appearance from the outside.

  The cowl top panel 16 is formed with a DR side pivot hole 16a and an AS side pivot hole 16b. From each pivot hole 16a, 16b, one end side of the DR side pivot shaft 25a and AS side pivot shaft 25b forming the wiper device 20 is extended, respectively, and each wiper arm is provided at one end side of each pivot shaft 25a, 25b. The proximal ends of 13b and 14b are attached.

  The wiper device 20 includes a wiper motor 21, and the wiper motor 21 includes an electric motor 22 and a gear case 23. Inside the electric motor 22, an armature shaft (not shown) having a worm on the tip side is rotatably provided. Here, as the electric motor 22, an electric motor with a brush, a brushless electric motor, or the like can be used.

  A worm wheel (not shown) that meshes with the worm of the armature shaft is rotatably accommodated in the gear case 23, and the worm and the worm wheel constitute a speed reduction mechanism. The deceleration mechanism decelerates the rotation of the armature shaft to a predetermined rotational speed, and outputs the rotational force that has been decelerated and increased in torque to the outside from the output shaft 23a provided on the worm wheel.

  The wiper device 20 includes a link mechanism (link member) 24 that converts the rotational motion of the wiper motor 21 into a swing motion. The link mechanism 24 forms an output shaft 23a of the wiper motor 21 and pivot shafts 25a and 25b. Between the DR side drive lever 26a and the AS side drive lever 26b as pivot levers. The link mechanism 24 is formed by a crank arm 24a, a drive rod 24b, and a connecting rod 24c. Here, in the wiper device 20, the wiper motor 21 side is disposed on the engine room (not shown) side, and the connecting rod 24c side is disposed on the vehicle interior (not shown) side.

  One end of the crank arm 24a is fixed to the output shaft 23a, and the other end of the crank arm 24a is rotatably connected to one end of the drive rod 24b via a ball joint (not shown). One end of the DR side drive lever 26a is fixed to the other end of the DR side pivot shaft 25a, and the other end of the DR side drive lever 26a is rotatable to the other end of the drive rod 24b via the ball joint BJ1 (see FIG. 6). It is connected to.

  One end of the AS side drive lever 26b is fixed to the other end of the AS side pivot shaft 25b, and the other end of the AS side drive lever 26b is rotatably connected to one end of the connecting rod 24c via a ball joint (not shown). Has been. The other end of the connecting rod 24c is rotatably connected to the other end of the DR side drive lever 26a via a ball joint BJ2 (see FIG. 6). Thereby, by rotating the wiper motor 21, the pivot shafts 25a and 25b are synchronously driven to swing in the same direction.

  As shown in FIG. 2, the wiper device 20 includes a DR-side wiper pivot device 30. The DR wiper pivot device 30 includes a DR pivot shaft 25a to which a DR drive lever 26a is fixed, a DR pivot holder 40 that rotatably supports the DR pivot shaft 25a, and ball joints BJ1 and BJ2 (see FIG. 6), and a DR-side pivot cover 50 that suppresses water exposure. Note that the DR-side wiper pivot device and the AS-side wiper pivot device, which are the essential parts of the present invention, are both configured in substantially the same manner, and therefore the description of the AS-side wiper pivot device is omitted in the following description. Only the side wiper pivot device 30 will be described in detail.

  As shown in FIGS. 2 and 3, the DR-side pivot holder 40 forming the DR-side wiper pivot device 30 is formed into a predetermined shape by casting a molten aluminum material or the like. The DR side pivot holder 40 includes a holder cylinder part 41 formed in a substantially cylindrical shape, and the holder cylinder part 41 can freely rotate the DR side pivot shaft 25a via a pair of bearings 42 (see FIG. 6). I support it. Thereby, the DR side pivot shaft 25a can be smoothly rotated.

  As shown in FIG. 6, a rubber O-ring 43 is disposed in the vicinity of the bearing 42 provided on the distal end side (upper side in the drawing) of the DR side pivot shaft 25a. The O-ring 43 prevents rainwater and the like from entering between the DR-side pivot shaft 25a and the holder tube portion 41, so that the DR-side pivot shaft 25a can rotate smoothly over a long period of time. It has become. Further, the DR side pivot shaft 25a is prevented from coming off by a retaining mechanism 44 made of a retaining ring or the like with respect to the holder cylindrical portion 41.

  As shown in FIGS. 3 and 6, an annular support step portion 41 a that engages with an engagement step portion 51 a (see FIG. 5) of the DR side pivot cover 50 is integrally provided on the radially outer side of the holder tube portion 41. The support step 41a is configured to position the DR side pivot cover 50 in the axial direction of the holder cylinder 41.

  The holder tube portion 41 is integrally provided with a frame fixing portion 45 so as to protrude outward in the radial direction. One end of a frame member (not shown) made of a hollow pipe is fixed to the frame fixing portion 45 by caulking. Here, a frame fixing portion (not shown) of the AS side pivot holder is similarly caulked and fixed to the other end of the frame member. Thus, the wiper device 20 is a so-called frame-integrated type. It is a modular wiper device.

  The holder tube portion 41 is integrally provided with a fixed leg portion 46 so as to protrude further outward in the radial direction. The fixed leg portion 46 is provided on the opposite side of the frame fixing portion 45 with the holder tube portion 41 interposed therebetween, and a rubber bush 46a (see FIG. 2) is attached to the fixed leg portion 46. The fixed leg portion 46 is attached to the vehicle body 11 via the bush 46 a, thereby preventing the vibration of the wiper motor 21 from being transmitted to the vehicle body 11.

  As shown in FIG. 3, an engaging convex portion 47 that protrudes radially outward of the holder tube portion 41 is integrally provided between the frame fixing portion 45 and the fixed leg portion 46 of the holder tube portion 41. . The engaging convex portion 47 extends in the axial direction of the holder cylinder portion 41 and reaches the support step portion 41a. The upper side of the engaging convex portion 47 in the drawing, that is, the side on which the DR-side pivot cover 50 is mounted. The DR-side pivot cover 50 has a tapered shape so that it can easily guide the engaging recess 51b (see FIG. 4B). The engagement convex portion 47 enters the engagement concave portion 51b of the DR side pivot cover 50, whereby the engagement convex portion 47 and the engagement concave portion 51b are engaged, and the DR side pivot holder 40 of the DR side pivot cover 50 is engaged. In addition to positioning in the circumferential direction, the DR side pivot cover 50 is also prevented from rotating with respect to the DR side pivot holder 40. Here, the engagement convex portion 47 is directed toward the engine room side (the vehicle front side) as shown in FIG. 6 in a state where the wiper device 20 is mounted in the mounting space 11a.

  A skirt portion 48 formed in a substantially arc shape is integrally provided on the lower side in the drawing along the axial direction of the holder cylinder portion 41, that is, on the DR side drive lever 26a side. The skirt portion 48 is provided along with the engaging convex portion 47 along the axial direction of the holder cylinder portion 41, and covers the side surface of the DR side drive lever 26a as shown in FIG. This prevents rainwater or the like drained from the drainage portion 55 of the DR side pivot cover 50 from hanging on the DR side drive lever 26a.

  As shown in FIGS. 4 and 5, the DR-side pivot cover 50 forming the DR-side wiper pivot device 30 is separated from the DR-side pivot holder 40, and is formed into a predetermined shape by injection molding a molten plastic material or the like. Is formed. The DR side pivot cover 50 includes a mounting portion 51 formed in a cylindrical shape to be mounted on the holder tube portion 41 (see FIG. 3) of the DR side pivot holder 40. The inner diameter dimension of the mounting portion 51 and the holder tube The outer diameter of the portion 41 is set to be substantially the same. Accordingly, the backlash of the DR side pivot cover 50 with respect to the DR side pivot holder 40 is suppressed under the state where the mounting portion 51 is attached to the holder cylinder portion 41.

  An annular engagement step portion 51a is provided on the proximal end side along the axial direction of the mounting portion 51 (the lower side in FIGS. 5 and 6) and on the radially inner side. As shown in FIG. 6, the engagement step portion 51 a is engaged with a support step portion 41 a provided on the holder tube portion 41. Further, on the drainage portion 55 side (right side in the drawing) along the radial direction of the mounting portion 51, an engagement recess 51b into which the engagement protrusion 47 of the holder tube portion 41 enters is provided. The inner shape of the engagement concave portion 51b is substantially the same shape (tapered shape) as the engagement convex portion 47, thereby facilitating the mounting of the engagement convex portion 47 to the engagement concave portion 51b. Then, when the engagement convex portion 47 enters the engagement concave portion 51b, the DR side pivot cover 50 is prevented from rotating with respect to the DR side pivot holder 40.

  The engagement step portion 51 a of the mounting portion 51 is engaged with the support step portion 41 a of the holder tube portion 41, and the distal end side (upper side in FIGS. 5 and 6) along the axial direction of the mounting portion 51 is related to the retaining mechanism 44. By being combined, the DR side pivot cover 50 is prevented from coming off from the DR side pivot holder 40. Here, when the DR side pivot cover 50 is mounted on the DR side pivot holder 40, the mounting portion 51 gets over the retaining mechanism 44. However, since the DR side pivot cover 50 is made of plastic and has flexibility, It can be easily installed.

  An annular bottom portion 52 is integrally provided on the base end side along the axial direction of the mounting portion 51, that is, on the engagement step portion 51 a side. The bottom portion 52 extends radially outward from the mounting portion 51 perpendicular to the axial direction of the DR-side pivot shaft 25a, and flows from the DR-side wiper member 13 side (see FIG. 1) of the DR-side pivot shaft 25a. It is designed to catch rainwater (water).

  In addition, a wall 53 is integrally provided on the radially outer side of the bottom 52, and the wall 53 extends toward one side (upper side in FIGS. 5 and 6) of the DR side pivot shaft 25a. Yes. That is, the wall portion 53 extends in the same direction as the mounting portion 51. As a result, rainwater or the like flowing to the bottom 52 flows inside the DR-side pivot cover 50 formed by the mounting portion 51, the bottom 52 and the wall 53. That is, the wall 53 has a function of suppressing leakage of rainwater or the like received by the bottom 52 to the outside of the DR side pivot cover 50.

  A water flow guide portion 54 is integrally provided between the mounting portion 51 of the bottom portion 52 and the wall portion 53 and on each ball joint BJ1, BJ2 side as a connecting portion. The water flow guide portion 54 is formed so as to protrude toward one side in the axial direction of the DR side pivot shaft 25 a, that is, toward the inside of the DR side pivot cover 50. The water flow guide portion 54 is formed in a substantially arc shape as shown in FIG. 4 and is provided over a range of about 180 ° on each ball joint BJ1, BJ2 side (left side in the drawing) sandwiching the mounting portion 51 of the bottom portion 52. It has been.

  As described above, the water flow guide portion 54 is formed to have a concavo-convex shape with respect to the bottom portion 52 in the axial direction of the DR-side pivot shaft 25a, so that rainwater flowing in the radial direction of the DR-side pivot shaft 25a through the bottom portion 52, etc. Compared with the route RT2 (see the broken line in FIG. 7B) of the route RT1 (see the broken line in FIG. 7B) of the route RT1 (see the broken line in FIG. 4A, FIG. 5 and FIG. Longer (RT1> RT2). As a result, the flow of rainwater or the like flowing toward the outside in the radial direction of the DR side pivot shaft 25a without changing the outer diameter dimension of the DR side pivot cover 50 is compared with that without the water flow guide portion 54. It can weaken along the part 54, and it can prevent now more reliably that rainwater etc. crosses the wall part 53, and is leaked outside. Here, in FIG.7 (b), the same code | symbol is attached | subjected to the part which has the function similar to Fig.7 (a).

  As shown in FIGS. 4 and 5, the water flow guide portion 54 includes an inclined surface 54 a that gently slopes toward the mounting portion 51 side, that is, the drainage portion 55 side, and the inclined surface 54 a has a diameter of the bottom portion 52. A substantially sliding base is formed from the outside in the direction toward the bottom 52. As a result, the rainwater received at the bottom 52 is smoothly guided toward the drainage portion 55, and the rainwater and the like can be effectively suppressed from being accumulated in the DR side pivot cover 50.

  Here, as shown in FIG. 5, the wiper device 20 (DR side pivot cover 50) is mounted on the front side (engine room side) of the vehicle body 11 at a predetermined angle α °, for example, 25 °. It has become. In this case, the water flow guide portion 54 is disposed on the vehicle interior side, and the drainage portion 55 is disposed on the engine room side. Therefore, rainwater and the like flowing into the DR side pivot cover 50 are easily concentrated in the drainage portion 55, and rainwater and the like flowing between the radially outer side of the water flow guide portion 54 and the wall portion 53 are It is easy to flow toward the drainage part 55 along the outer peripheral part of the water flow guide part 54.

  On the opposite side of the mounting portion 51 from the water flow guide portion 54 side, that is, on the side opposite to the ball joints BJ1, BJ2 side along the radial direction of the mounting portion 51, a drainage portion 55 comprising a plurality of drainage holes 55a is provided. Is provided. Five drain holes 55a are provided at equal intervals (for example, at intervals of 15 °) along the circumferential direction of the wall portion 53, so that the inside of the wall portion 53 communicates with the outside. As a result, rainwater or the like flowing into the DR side pivot cover 50 and concentrated in the drainage portion 55 is quickly drained into the engine room from each drainage hole 55a. However, the size and number of the drain holes 55a are not limited to those shown in the drawing, and can be arbitrarily set according to the rigidity required for the DR side pivot cover 50.

  On the back surface of the bottom 52 (lower side in FIGS. 5 and 6), the other side in the axial direction of the DR-side pivot shaft 25a (lower side in FIGS. 5 and 6) close to the drainage portion 55, that is, each drainage hole 55a. ) Is provided integrally with the tongue piece 55b. Similarly to the skirt portion 48 of the DR side pivot holder 40, the tongue piece 55b is also formed in a substantially arc shape. The tongue piece 55b has a function for reliably discharging rainwater or the like drained from each drain hole 55a toward the engine room.

  As shown in FIG. 6, the DR-side wiper pivot device 30 is mounted in the mounting space 11a by projecting one axial direction side of the DR-side pivot shaft 25a from a substantially central portion of the DR-side pivot hole 16a. The inner diameter dimension of the DR side pivot hole 16a is set to an inner diameter dimension smaller than the inner diameter dimension of the wall portion 53, so that the radially inner side of the DR side pivot hole 16a faces the axial direction of the DR side pivot shaft 25a. Thus, it overlaps with the inclined surface 54 a of the water flow guide portion 54. In this way, by mounting the wiper device 20 in the mounting space 11a so as to have the arrangement relationship shown in FIG. 6, rainwater or the like flowing into the DR side pivot cover 50 through the windshield 12 and the cowl top panel 16 Can be guided by the inclined surface 54a. Thereby, rain water and the like inside the DR side pivot cover 50 are efficiently collected in each drain hole 55a, and can be quickly drained to the outside (inside the engine room).

  Next, the flow path of rainwater and the like in the DR-side wiper pivot device 30 formed as described above will be described in detail with reference to the drawings.

  Rainwater or the like adhering to the windshield 12 due to the wiping operation of the wiper device 20 is caused by the DR side pivot hole 16a through the windshield 12 and the cowl top panel 16 as shown by the thick arrows in FIGS. Flow into. Then, rainwater or the like flows into the DR side pivot cover 50 and is received by the bottom 52. Thereafter, rainwater or the like received by the bottom portion 52 flows toward the drainage portion 55 due to the inclination of the DR side pivot cover 50, and is quickly drained into the engine room through the drainage holes 55a.

  A part of rainwater or the like received by the bottom portion 52 is bounced back to the mounting portion 51 and flows to the outside in the radial direction of the bottom portion 52 through the water flow guide portion 54 as shown in FIG. At this time, since the flow of rainwater or the like is along the route RT1 (the present invention) set to a long length, compared to the route RT2 (comparative example) set to a short length shown in FIG. , The momentum of the flow (flow velocity) can be greatly reduced. As a result, as shown by the broken line arrows in FIGS. 6 and 7 (a), it is possible to suppress leakage of rainwater and the like through the wall portion 53, and consequently prevent the ball joints BJ1 and BJ2 from getting wet. be able to. Here, as shown in FIG. 7B, in the comparative example that does not include the water flow guide portion 54, since the route RT2 is short, the momentum of the flow of rainwater or the like cannot be sufficiently reduced. As shown by the arrow, rainwater or the like easily leaks outside the wall 53, and as a result, the ball joints BJ1 and BJ2 may be frequently flooded.

  As described above in detail, according to the DR-side wiper pivot device 30 according to the first embodiment, the DR-side pivot cover 50 attached to the DR-side pivot holder 40 is attached to the attachment portion 51, the bottom portion 52, and the wall portion 53. Between the mounting portion 51 of the bottom portion 52 and the wall portion 53, and on the ball joints BJ1 and BJ2 side, with respect to the bottom portion 52, has an uneven shape toward the axial direction of the DR side pivot shaft 25a, A water flow guide portion 54 that elongates a route RT1 of rainwater or the like flowing in the radial direction of the DR side pivot shaft 25a through the bottom portion 52 is provided, and the bottom portion 52 is provided on the opposite side of the mounting portion 51 from the water flow guide portion 54 side. A drainage portion 55 is provided for draining rainwater received in step 1 to the outside.

  Therefore, the path RT1 such as rainwater flowing in the radial direction along the bottom 52 on the ball joint BJ1 and BJ2 side of the DR side pivot cover 50, the conventional case where the water flow guide portion 54 is not provided (see FIG. 7B). As a result, the momentum of the flow in the radial direction of rainwater or the like received at the bottom 52 can be reduced. Therefore, it is possible to prevent rainwater or the like received by the bottom portion 52 from passing over the wall portion 53 and leaking to the outside, and thus to improve the reliability of the wetness of the DR-side wiper pivot device 30. Further, since the DR side pivot cover 50 is a separate body and the water flow guide portion 54 is formed in a concave and convex shape that can flow through rainwater and the like, it is not necessary to increase the height and depth of the concave and convex shape. It is possible to suppress the shape of the side pivot cover 50 from becoming complicated, thereby suppressing an increase in manufacturing cost.

  Further, according to the DR-side wiper pivot device 30 according to the first embodiment, the water flow guide portion 54 is formed so as to protrude on one side in the axial direction of the DR side pivot shaft 25a, and the water flow guide portion 54 side of the water flow guide portion 54 Since the inclined surface 54a for guiding the flow of rainwater or the like toward the drainage portion 55 is provided, the rainwater received at the bottom 52 can be smoothly guided toward the drainage portion 55, and consequently the DR side pivot. Accumulation of rainwater or the like on the cover 50 can be suppressed.

  Furthermore, according to the DR-side wiper pivot device 30 according to the first embodiment, the DR-side wiper pivot device 30 is formed on the cowl top panel 16 of the mounting space 11a in which the DR-side wiper pivot device 30 is mounted. Since the inner side in the radial direction of the side pivot hole 16a is mounted on the mounting space 11a so as to overlap the inclined surface 54a in the axial direction of the DR side pivot shaft 25a, the side pivot hole 16a flows from the cowl top panel 16 through the DR side pivot hole 16a. The incoming rainwater or the like can be guided to the inclined surface 54a, and the rainwater or the like of the DR side pivot cover 50 can be efficiently drained to the outside.

  Further, according to the DR-side wiper pivot device 30 according to the first embodiment, the holder cylindrical portion 41 is provided with the engaging convex portion 47 protruding outward in the radial direction of the holder cylindrical portion 41, and the drainage portion of the mounting portion 51. Since the engagement convex portion 47 enters the 55 side and the engagement concave portion 51b for preventing the DR side pivot cover 50 from rotating with respect to the DR side pivot holder 40 is provided, the DR side pivot cover 50 is erroneously assembled to the DR side pivot holder 40. As a result, assembly workability can be improved.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings. Note that parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 8 is a sectional view corresponding to FIG. 5 of the pivot cover according to the second embodiment.

  In the second embodiment, the configuration of the DR-side pivot cover 50 that forms the DR-side wiper pivot device 30 (see FIG. 6) is different. Specifically, as shown in FIG. 8, only the shape of the water flow guide portion 60 provided in the bottom portion 52 is different. The water flow guide portion 60 of the DR side pivot cover 50 according to the second embodiment is formed so as to protrude toward the other axial side of the DR side pivot shaft 25a, that is, toward the outside of the DR side pivot cover 50. The water flow guide portion 60 is formed so as to be mirror-symmetric with respect to the water flow guide portion 54 (see FIG. 5) of the DR-side pivot cover 50 according to the first embodiment, with the bottom portion 52 as the boundary surface.

  The length of the path of rainwater or the like including the water flow guide unit 60 is set to RT1 (see the two-dot chain line in the figure) as in the first embodiment. In addition, an inclined surface 60 a that is gently inclined is provided on the drainage portion 55 side of the water flow guide portion 60, and no corner is formed on the drainage portion 55 side of the waterflow guide portion 60. Accordingly, rainwater or the like does not accumulate in the recess formed by the water flow guide portion 60, and a long length path RT1 can be secured.

  Also in the second embodiment formed as described above, the same effects as those in the first embodiment described above can be achieved.

  Next, third and fourth embodiments of the present invention will be described in detail with reference to the drawings. Note that parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  9 is a partially enlarged sectional view corresponding to the broken line circle C portion of FIG. 5 of the pivot cover according to the third embodiment, and FIG. 10 is a broken line circle C portion of the pivot cover according to the fourth embodiment in FIG. The corresponding partial enlarged sectional views are respectively shown.

  In the third and fourth embodiments, the configuration of the DR side pivot cover 50 forming the DR side wiper pivot device 30 (see FIG. 6) is different. Specifically, as shown in FIGS. 9 and 10, only the shapes of the drainage portions 70 and 80 are different.

  As shown in FIG. 9, the drainage portion 70 of the DR side pivot cover 50 according to the third embodiment has a wall portion extending in the extending direction of the wall portion 53, that is, along the axial direction of the DR side pivot shaft 25 a. 53, a plurality of drainage cutouts 70a (total of five, only three shown in the figure) are formed. Also in the drainage part 70 formed in this way, rainwater or the like flowing into the DR side pivot cover 50 can be quickly drained to the outside as shown by the thick arrow in FIG.

  As shown in FIG. 10, the drainage portion 80 of the DR-side pivot cover 50 according to the fourth embodiment penetrates the bottom portion 52 toward the axial direction of the DR-side pivot shaft 25a near the wall portion 53 of the bottom portion 52. Are formed from a plurality of drain holes 80a (five in total, only one shown in the figure). By providing each drainage hole 80a in the bottom part 52, in this embodiment, the tongue piece 80b is disposed radially inward from the part of the bottom part 52 provided with each drainage hole 80a. Also in the drainage part 80 formed in this way, rainwater or the like that has flowed into the DR side pivot cover 50 can be quickly drained to the outside as indicated by the thick arrows in FIG.

  In the third and fourth embodiments formed as described above, the same operational effects as those of the first embodiment described above can be obtained.

  It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in each of the above-described embodiments, as the water flow guide portion in the present invention, the water flow guide portion that protrudes to one axial side of the DR side pivot shaft 25a (water flow guide portion 54) and the other axial side of the DR side pivot shaft 25a. However, the present invention is not limited to this, and the present invention is not limited to this, and an uneven shape (waveform shape) that protrudes alternately on one side and the other side of the DR side pivot shaft 25a. It is also good. In short, it is only necessary that the path of rainwater or the like that travels through the bottom 52 can be made longer than a path that does not have a water flow guide section (see FIG. 7B).

  Moreover, in each said embodiment, although the case where the drainage part in this invention was formed in any one of the wall part 53 or the bottom part 52 was shown, this invention is not limited to this, DR side pivot cover 50 Along the circumferential direction, the wall portions 53 and the bottom portions 52 may be alternately arranged. That is, for example, as shown in FIGS. 9 and 10, the drainage notches 70 a and the drainage holes 80 a can be alternately arranged along the circumferential direction of the DR-side pivot cover 50.

  Furthermore, in each of the above embodiments, the DR-side wiper pivot device 30 that forms the wiper device 20 whose wiping pattern is a tandem type is shown as an example in which the present invention is applied. The present invention can also be applied to a wiper pivot device that forms a wiper device having another wiping pattern.

  Further, in each of the above embodiments, the DR-side wiper pivot device 30 that forms the wiper device 20 for wiping the front windshield 12 on the front side of the vehicle 10 is shown, but the present invention is not limited thereto. The present invention can also be applied to a wiper pivot device that forms a wiper device for wiping a rear window glass provided on the rear side of the vehicle 10 or a window glass of a railway vehicle or an aircraft.

10 vehicle 11 vehicle body 11a mounting space (mounting part)
DESCRIPTION OF SYMBOLS 12 Windshield 13 DR side wiper member 13a DR side wiper blade 13b DR side wiper arm 14 AS side wiper member 14a AS side wiper blade 14b AS side wiper arm 15a, 15b Wiping range 16 Cowl top panel (wiper cover)
16a DR side pivot hole 16b AS side pivot hole 20 Wiper device 21 Wiper motor 22 Electric motor 23 Gear case 23a Output shaft 24 Link mechanism (link member)
24a Crank arm 24b Drive rod 24c Connecting rod 25a DR side pivot shaft 25b AS side pivot shaft 26a DR side drive lever 26b AS side drive lever 30 DR side wiper pivot device 40 DR side pivot holder 41 Holder cylinder portion 41a Support stepped portion 42 Bearing 43 O-ring 44 Retaining mechanism 45 Frame fixing part 46 Fixing leg part 46a Bushing 47 Engaging convex part 48 Skirt part 50 DR side pivot cover 51 Mounting part 51a Engaging step part 51b Engaging concave part 52 Bottom part 53 Wall part 54 Water flow guide Part 54a Inclined surface 55 Drain part 55a Drain hole 55b Tongue piece 60 Water flow guide part 60a Inclined surface 70 Drain part 70a Drain notch 80 Drain part 80a Drain hole 80b Tongue piece BJ1, BJ2 Ball joint (connecting part)
RT1, RT2 path LRP lower reverse position URP upper reverse position

Claims (5)

A pivot shaft to which the wiper member is attached, a pivot holder that rotatably supports the pivot shaft, and a pivot cover that is attached to the pivot holder and prevents the connecting portion between the pivot shaft and the link member from being wetted. A wiper pivot device comprising:
The pivot cover is
A mounting portion mounted on a holder tube portion of the pivot holder;
A bottom portion extending radially outward of the pivot shaft from the mounting portion and receiving water flowing from the wiper member side of the pivot shaft;
A wall portion extending from the bottom portion to one side in the axial direction of the pivot shaft and suppressing leakage of the water received by the bottom portion to the outside;
The pivot portion is provided between the mounting portion and the wall portion of the bottom portion and on the connecting portion side, and has an uneven shape toward the axial direction of the pivot shaft with respect to the bottom portion, and is transmitted through the bottom portion to the pivot shaft. A water flow guide portion that lengthens the path of the water flowing in the radial direction of
A drainage part provided on the opposite side of the water flow guide part across the mounting part, and draining the water received at the bottom part to the outside;
A wiper pivot device characterized by comprising:   2. The wiper pivot device according to claim 1, wherein the water flow guide portion is formed so as to protrude toward one axial direction of the pivot shaft, and the water flow guide portion has the water flow portion toward the water discharge portion. A wiper pivot device comprising an inclined surface for guiding the flow of the wiper.   3. The wiper pivot device according to claim 2, wherein the wiper pivot device is configured such that a radially inner side of a pivot hole formed in a wiper cover of a mounting portion on which the wiper pivot device is mounted is inclined toward the axial direction of the pivot shaft. A wiper pivot device mounted on the mounting portion so as to overlap a surface.   The wiper pivot device according to any one of claims 1 to 3, wherein the drainage portion is formed on at least one of the bottom portion and the wall portion.   The wiper pivot device according to any one of claims 1 to 4, wherein an engagement convex portion that protrudes radially outward of the holder tube portion is provided on the holder tube portion, and the drainage portion side of the mounting portion is provided. The wiper pivot device according to claim 1, wherein an engagement recess is provided to prevent the pivot cover from rotating relative to the pivot holder.

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